Journal Article

Brassinosteroids Control the Proliferation of Leaf Cells of <i>Arabidopsis thaliana</i>

Masaki Nakaya, Hirokazu Tsukaya, Noriaki Murakami and Masahiro Kato

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 2, pages 239-244
Published in print February 2002 | ISSN: 0032-0781
Published online February 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf024
Brassinosteroids Control the Proliferation of Leaf Cells of Arabidopsis thaliana

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  • Biochemistry
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The growth of leaves in the model plant, Arabidopsis thaliana (L.) Heynh., is determined by the extent of expansion of individual cells and by cell proliferation. Mutants of A. thaliana with known defects in the biosynthesis or perception of brassinosteroids develop small leaves. When the leaves of brassinosteroid-related mutants, det2 (de-etiolated2 = cro1) and dwf1 (dwarf1 = cro2) were compared to wild-type plants, an earlier cessation of leaf expansion was observed; a detailed anatomical analysis further revealed that the mutants had fewer cells per leaf blade. Treatment of the det2 mutants with the brassinosteroid, brassinolide, reversed the mutation and restored the potential for growth to that of the wild type. Restoration of leaf size could not be explained solely on the basis of an increase in individual cell volume, thus suggesting that brassinosteroids play a dual role in regulating cell expansion and proliferation.

Keywords: Key words: Arabidopsis thaliana — Brassinosteroid — Cell proliferation — cro mutants — det2 mutant — Leaf morphogenesis.; Abbreviations: BL, brassinolide; BRs, brassinosteroids.

Journal Article.  3121 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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